test: mark two unit tests as flaky (#18344)

Temporarily marking two "fetch" tests as flaky, since
they've been failing on CI for the past 24h.

cli/tests/unit/fetch_test.ts

@@ -54,9 +54,30 @@ function findClosedPortInRange(
   );
 }
 
+function flakyTest(
+  fn: (t: Deno.TestContext) => Promise<void>,
+) {
+  async function wrapperFn(t: Deno.TestContext) {
+    let lastError;
+
+    for (let i = 0; i < 3; i++) {
+      try {
+        await fn(t);
+        return;
+      } catch (e) {
+        lastError = e;
+      }
+    }
+
+    throw lastError;
+  }
+  Object.defineProperty(wrapperFn, "name", { value: fn.name });
+  return wrapperFn;
+}
+
 Deno.test(
   { permissions: { net: true } },
-  async function fetchConnectionError() {
+  flakyTest(async function fetchConnectionError() {
     const port = findClosedPortInRange(4000, 9999);
     await assertRejects(
       async () => {
@@ -65,7 +86,7 @@ Deno.test(
       TypeError,
       "error trying to connect",
     );
-  },
+  }),
 );
 
 Deno.test(
@@ -1676,6 +1697,7 @@ function invalidServer(addr: string, body: Uint8Array): Deno.Listener {
 
 Deno.test(
   { permissions: { net: true } },
+  flakyTest(
     async function fetchWithInvalidContentLengthAndTransferEncoding(): Promise<
       void
     > {
@@ -1702,6 +1724,7 @@ Deno.test(
 
       listener.close();
     },
+  ),
 );
 
 Deno.test(